Unlock codes for phones default to the last 4 digits of your phone number. This covers the phone itself as well as any memory attached to it. If you are regarding a combo that is a PDA/Smartphone, it may be different.

Unlock codes for phones default to the last 4 digits of your phone number.

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that's not what I mean, that's a erpsonal security code you're talking about

a person can take most phones and unlock the software...then use the phone with another provider besides the one it was purchased

for instance if you buy a sprint phone they will tell you it can only be used with sprint cdma...this isn't true, it can be unlocked and used with other providers
so if this data card can be unlocked and used with other providers a person won't have to switch to sprint to use it